Multiple nest entrances alter foraging and information transfer in ants

Area of Science:

• Ecology
• Animal Behavior
• Entomology

Background:

• Ant colonies depend on efficient resource discovery and exploitation.
• Nest entrances are critical hubs for information and food transfer between foragers and inner-nest workers.
• Nest architecture, specifically the number of entrances, may influence colony foraging efficiency.

Purpose of the Study:

• To investigate how the number of nest entrances affects the social foraging behavior of *Myrmica rubra* colonies.
• To determine if varying nest entrance numbers impact recruitment, pheromone trail formation, and food retrieval.

Main Methods:

• Comparison of foraging responses in *Myrmica rubra* colonies with one versus two nest entrances.
• Quantification of worker outflows to a sucrose food source.
• Assessment of recruitment initiation, pheromone trail emergence, and recruit success in reaching the food target.

Main Results:

• Total worker outflows were similar between one- and two-entrance nests.
• Two-entrance nests showed delayed recruitment initiation.
• Pheromone trail emergence and recruit success were reduced in two-entrance nests, leading to less food collected.

Conclusions:

• An increased number of nest entrances can decrease social foraging efficiency in ants.
• Nest entrances play a crucial role in the transfer of information essential for collective foraging.
• Nest architecture significantly influences foraging patterns beyond the immediate nest vicinity.